Sliding-door lock



(No Mode-l.)

A. H. 0'. TREPTB.

SLIDING DOOR LOOK.

No. 573,934. Patented Deo. 29, 1896.

vrrrn'sslm UNITED STATES ATENT OFFIGE.

ALFRED H. C. TREPTE, OF ST. PAUL, MINNESOTA.

SLIDING-DOOR LOCK.

SPECIFICATION forming part of Letters Patent No. 573,934, dated December29, 1896.

Application filed December 9, 1895.

To aZZ whom it may concern:

Be it known that I, ALFRED H. C. TREPTE,

a citizen of the United States, residing at St.

Paul, in the county of Ramsey and State of Minnesota, have inventedcertain new and panying drawings, and to the figures of reference markedthereon, which form a part of this specification.

My invention relates to improvements in looks, the main features ofwhich may be applied in looks for doors, drawers, trunks, &c., but areespecially adapted for sliding doors used for-elevator-shafts,bank-inclosures, &c., usually made of wirework or light iron.

It will be observed that in ordinary locks of the self-locking type thelocking-bolt is spring-held forward into the locking position, and thelock may therefore be picked or opened by any instrument pressingagainst the front end of the bolt orby inserting a knife or chiselbetween the lock and the strikingplate and by the sharp edge of theinstrument take hold of the surface of the bolt and push it back, or ifinstead of a plainbolt one or two hooks are used for taking hold of thestriking-plate such hooks may likewise be disengaged from thestriking-plate by pressing upon them with a suitable instrument in frontof the look, as already stated.

It will further be observed that many an accident has been caused by thedoors of elevators being opened by others than the regular operator, andthat the opening has been done by putting a finger or two through theWirework surrounding the lock and touching the locking device 011 theinner side of the door.

The object of my invention is to overcome the above-described defectsand thus avoid the consequences thereof, and I attain my objects by thenovel construction and arrangement of parts illustrated in the accompanying drawings, in which Figure 1 is a side elevation of my complete lookas viewed from the inside of an elevatordoor. Fig. 2 is a side elevationthe same as Serial No. 571,522. (No model.)

in Fig. 1, only that the cover of the lock-case and the strikingplateare removed. Fig. 3 is a sectional view as on the line a a in Figs. 1and 2. Fig. 4E is a front edge View of the lock. Fig. 5 is an edge View,and Fig. 6 is a side or plan view, of the striking-plate.

Referring to the various parts by referencenumerals, 7 designates thecase or frame of the lock, which has the regular face 8, rim 9, keyhole10, and internally-screw-threaded stud 11 for receiving the screw 12, bywhich the cover 13 is held in place and forms one of the side walls ofthe lock-case.

The face 8 of the lock is provided with an elongated hole 14., aroundwhich is provided upon the outside of the face a rigid pocket 15, havingtwo oppositelydocated apertures 16 near its front end at such a distancefrom the face 8 as to insure their passing through the striking-plate 17when the door is shut.

18 are two levers pivotally placed upon the studs 19 and provided withthe hooks 20, projecting out of the apertures 16 at opposite sides ofthe pocket. The rear ends of said levers 18 are normally held towardeach other by the springs 22, secured in the posts 23, so that thebeveled hooks 20 are at all times ready to slip into and take hold atthe back side of the striking-plate 17 and when thus locked there is noaccess to the hooks by any instrument inserted between the lock and thestriking-plate, the pocket 20 being there solid.

In Fig. 1, 24 are the screws by which the striking-plate 17 may besecured to the doorframe, and 25 are the rivets by which the lock issecured to the door. If the latter is of a shape to admit it, the lockmay be secured by screws passed through the holes 26. (Shown in Fig. 4.)

Turning again to the levers 18, it will be observed that they are keptin place ontheir studs 19 by a lug 27 (shown in Fig. 3) and are to bespread against the resistance of the springs 22 by the rounded end 28 ofthe arm 29, that extends from a sliding plate or slide 30, whichslidesguidingly between the guiding-lugs 31, 32, 33, and 34, of whichthe two latter carry antifriction-rollers 35.

36 is a fiat spring of which the upper end engages the notch 37 in theslide and holds it normally in the retracted position shown in Fig. 2. it

- from the out-side.

38 is the notch in the slide in which the bridge of the key takes holdand pushes the slide toward the front of the look when the latter is tobe unlocked by means of the key The slide 30 may also be urged forwardand unlock the look from the inside of the door by means of the obliquerod 39, pivoted to the slide at 40, and the pushbutton 41 and itspushing-rod 42, to which theother end of the rod 39 is pivoted at 43.

44 is a V-shaped flat spring having holes in its arms, which are droppedupon the stem 45 of the lock-case and 46 of the pushing-rod.

48 is the knob or handhold by which the door is moved on its track. Thisknob is in the present instance secured to the look by the rivets 49. Ithas a central hole 50, in which the rod 42 slides, and a cavity 51, inwhich the press -button 41 is housed and guarded from sight and out ofreach of those outside the door, even though the latter may have littlemeshes, as is often the case with the class of doors referred to.

52 is an antifriction-roller guidingly touching the rear side of thepushing-rod 42. It is journaled on the pin 53, secured in two lugs 54,of which one is shown in Fig. 3, and which may preferably be madeintegral with the knob 48.

55 are lugs projecting from the cover of the lock and serve to keep theslide 30 in posit-ion against the opposite side of the lock.

The spring 44 assists in moving the rod 42 and button 41 back into theirnormal position after receiving a push.

In operation, if the lock is used,for instance, on a slidingelevator-door, with the strikingplate 17 secured on the frame thereof,the operator uses the key 56, opens the door, removes the key, entersthe elevator, and uses only the knob 48 and press-button 41 from theinside. Every time he Wants to open the door he takes hold of the knob48, and with the thumb of the same hand grasping the knob he presses onthe button 41, which causes the rod 39 to push the slide 30 forward,whereby the arm 29 28 is forced in between the ends 21 of the levers 18,the jaws 2O disengaged from the striking-plate, and the door isinstantly unlocked. The locking of the door is simply done by a push onthe knob 48, so as to shut the door, and the locking mechanism locksitself. The slanted shape of the hooks 20 makes them slip through thestriking-plate by assuming the position shown in dotted lines in Fig. 2,and the springs 22 cause the hooks to spread and engage thestriking-plate after passing through it.

It is obvious that in a simplified style of this look theantifriction-rollers may be dispensed with, and so may either the key orthe knob or push-button.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. A look having a striking-plate and a pair of spring held pivotedlevers projecting through the face-plate of the lock and having theirfront ends formed into hooks adapted to slip through and take hold ofthe strikingplate, a rigid pocket or socket upon the front face of thelock, surrounding and shielding the hooks between the lock and thestrikingplate; a guided slide inside the lock, having an arm enteringbetween and spreading the rear ends of the said levers so as to unlockthe hooks on the front ends, akey for moving said slide in between thelevers, a spring for retracting the slide when released from the key,and springs for holding the levers normally toward the slide, and theirhooks projecting beyond the sides of the pocket, substantially as shownand described.

2. In a lock of the class described, the combination of thestriking-plate 17, the hooks 20, for taking hold of said plate, andspringclosed pivoted levers 18, extending from the hooks, the slide 30,normally spring held toward the rear of the lock and having the notch38, for a key to engage, and the arm 29 with the rounded end 28,entering between the rear ends 21, of the levers 18; aspringheldpush-button upon one side of the lock with a pivoted connecting-rodpushing forward on the slide when the button is pressed on, and upon theother side of the look a removable key as 56, adapted to engage thenotch 38, substantially as and for the purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

ALFRED H. C. TREPTE.

Vitnesses:

A. M. CARLSEN, FRITZ MACK.

ICC

